Microwave oven



FIG. 1 is a perspective view of the top, front and right side of a microwave oven showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational thereof;

FIG. 5 is a right side elevational thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a microwave oven, as shown. 